Question detail
Which gases are considered possible early atmospheric gases?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The composition and evolution of the Earth's atmosphere
Question
- A. Methane and ammonia
- B. Oxygen and nitrogen
- C. Carbon dioxide and water vapour
- D. Hydrogen and helium
Answer
The correct option is Methane and ammonia. This answer is correct because it matches the approved learning objective to describe possible early atmospheric gases including methane and ammonia in the subtopic The Earth's early atmosphere.
Explanation
The correct option is Methane and ammonia. Methane and ammonia is correct because it directly supports the approved learning objective to describe possible early atmospheric gases including methane and ammonia. This belongs to the subtopic The Earth's early atmosphere within The composition and evolution of the Earth's atmosphere, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from The Earth's early atmosphere.
Common mistake
Confusing Early Gases
Students often confuse methane and ammonia as being the same gas when describing possible early atmospheric gases.
Remember that methane (CH₄) is a hydrocarbon, while ammonia (NH₃) is a nitrogen compound. Make sure to distinguish between their chemical formulas and properties.
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